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structural_mechanics.py
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Wed, Jul 10, 10:23

structural_mechanics.py
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#!/usr/bin/env python
# coding: utf-8
# # Test of Structural Mechanics
# We will now test the python interface of teh structural mechanics part.
# For that we will use the test `test/test_model/test_structural_mechanics_model/test_structural_mechanics_model_bernoulli_beam_2.cc`, which we will simply reproduce.
import py11_akantu as aka
# Creating the Mesh
# Create a mesh for the two dimensional case
beam = aka.Mesh(2)
# read in the mesh description
beam.read("_bernoulli_beam_2.msh", aka.MeshIOType._miot_gmsh_struct)
# Creating the Model
model = aka.StructuralMechanicsModel(beam)
# Setting up the Model
# Creating and Inserting the Materials
mat1 = aka.StructuralMaterial()
mat1.E = 3e10
mat1.I = 0.0025
mat1.A = 0.01
model.addMaterial(mat1)
mat2 = aka.StructuralMaterial()
mat2.E = 3e10
mat2.I = 0.00128
mat2.A = 0.01
model.addMaterial(mat2)
# Initializing the Model
# model.initFull(analysis_method = aka.AnalysisMethod._static)
model.initFull()
# Assigning the Materials
materials = model.getElementMaterialMap(aka.ElementType._bernoulli_beam_2)
print(hex(materials.ctypes.data))
# Once we have written to the `materials` variable, everything becomes unstable.
# And the kernel will die.
materials[0][0] = 0
materials[1][0] = 1
print(materials)
# Setting Boundaries
M = 3600.
q = -6000.
L = 10.
forces = model.getExternalForce()
print(forces)
# Neumann
forces[2, 2] = -M
forces[0, 1] = q * L / 2
forces[0, 2] = q * L * L / 12
forces[1, 1] = q * L / 2
forces[1, 2] = -q * L * L / 12
print(forces)
# Dirichlets
boundary = model.getBlockedDOFs()
boundary[0, :] = True
boundary[1, :] = False
boundary[2, :] = False
boundary[2, 1] = True
print(model.getExternalForce())
model.solveStep()
disp = model.getDisplacement()
d1 = disp[1, 2]
d2 = disp[2, 2]
d3 = disp[1, 0]
print(d1, 5.6 / 4800)

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